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@with grtis-duftet @fitta SAMUEL T. HEMINWAY, 0F .SAMTQGA SPRINGS, lNEWYORK. .LettersPztent No. 73,182-, dttted'January 7, 1868.

IMPROVEMENT IN BURGLAR-ALARM LOCKS.

To ALL-WHOM IT MAY ooNonRN:

Be it knownthat I, SAMUEL T HEMINWAY, of Saratoga Springs, in the countyof Saratoga, and State of New York, have invented' a new and usefulDoor-Alarm Lock; and I do hereby declare that the following is a.`

full, clear, and exact description thereof, reference being had totheaccompanying drawings, makinga. part of this specification, inwhic'hlFigure 1 is a perspective view of my'invention, aseombiued with anordinary door-lock. o

Figure 2 isa sectional and more precise view of the main-spring wheel,pawl, and ratchet, showing the motive-power, and their bearingsasmoreparticularly described hereinafter.

Similar letters ofteference indicate corresponding parts in thesevernlgures.

The objectof my invention is tocombine, with an ordinary door-lock, analarm of suieient capaeitythat, when adjustedto a door, aud properlyset, will give warning of the entrance of any person.

To enable others skilled in the art to-make aud'u'se my invention, Iwill proceed to describe its vconstruction and operation.` I Y Thisimprovement consists in arranging, in the inside of an ordinarydoor-lock, alarm-works, being respectively the main-spring wheel N andits attachments, esenpewheel G, verge F, and hammer E, combinedwith-aeertain arm, A, lever B, spring C, and its attached arm R', all'actingiu connection upon the latch-bolt D, that when the alarm-works arewoundup, and lever B` properly adjusted. by turningvthe knob of the lockconnected with the latch-bolt D, either way upon the outside or insideof the door, the hummerE attached to the shaft of the verge F, andpassing throughan aperture, H, in -the side ofthe lock, is adected,striking the bell I immediately attached to the outside of thelock,thereby causing-an instantaneous and continued alarm` for :i definitelength of time. vBy means of the pawl J, attached on the inside of thelock to the shaft K, as more particularly shown in iig. 2, which-shaftpasses through and is operated upon the'outside ofthe lock,Athe.ratchet-Wheel L, attached to the arbor M of the maimspring wheel N,may be so utleetedas toholld the alarm-works in cheek whvenwohnd up. Themain-spring-wheel arbor M, .having its in side. bearing upon the-plateQ, passes to theoutside of the iock, where the key P is attached, bywhich means the main-spring O ,is wound. The arm R is permanentlyconnested with the spring ou the principle of a swivel, that when outthrough theaperture S in' the side of the lock, the spring Cmay beconredby turning the arm R, so that l.its shoulders obstructits passagethrough the apertures, but4 by releasing the spring C, and allowing thearm Rto pass in through the aperture S, the spring C rests against thelever B for the'speeial purpose and to beused when a person passes outofthe door andpdcsires to leave the alarm'set after ,closing the same. Atother times the spring C c'nnlbe con-fined as above described, and thealarm set by adjusting the armend oflever B, as set forth hereafter.

Having thus described my invention," and the manner of its operation, Inow ela-im, and desire to secure by Letters Patent, the applicationfollowing The combination und arrangement of the pivoted lever B; havingits outer :trui-projecting through the aperture T on the top of thelock, the notched arm A securedto the verge, the springC, and'arm R,substantially as described, for the purpose speeied.

YWitnesses:

WILL. K.' WHITE, Roer. A. HEMINWAY.

SAMUEL T. HEMINWAY.

